java判断图片格式 java获取图片尺寸

package util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
  
/**
 * 通过java获取图片的宽和高
 * @author sunlightcs
 * 2011-6-1
 * http://hi.juziku.com/sunlightcs/
 */
public class ImageTools {
      
    /**
     * 获取图片宽度
     * @param file  图片文件
     * @return 宽度
     */
    public static int getImgWidth(File file) {
        InputStream is = null;
        BufferedImage src = null;
        int ret = -1;
        try {
            is = new FileInputStream(file);
            src = javax.imageio.ImageIO.read(is);
            ret = src.getWidth(null); // 得到源图宽
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ret;
    }
      
      
    /**
     * 获取图片高度
     * @param file  图片文件
     * @return 高度
     */
    public static int getImgHeight(File file) {
        InputStream is = null;
        BufferedImage src = null;
        int ret = -1;
        try {
            is = new FileInputStream(file);
            src = javax.imageio.ImageIO.read(is);
            ret = src.getHeight(null); // 得到源图高
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ret;
    }
}

package util;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;

import javax.imageio.ImageIO;

public class test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		String imagePath="F:\\images\\1.jpg";
		
		//System.out.println("高"+ImagesUtil.GetPhotoHeight(imagePath));
		//System.out.println("宽"+ImagesUtil.GetPhotoWidth(imagePath));
		
		 String imageUrl="http://avatar.csdn.net/9/F/2/1_5iasp.jpg"; 
		 String url="F:/images/1.jpg";
		 /* Map<String,Integer> map=ImagesUtil.GetImageResolution(imageUrl);
		  if(map!=null){
			 
			  System.out.println(map.get("width"));
			  System.out.println(map.get("width"));
		  }else{
			  System.out.println("图片路径或者格式不正确");
		  }  */
		File file=new File(url);
		Integer i= ImageTools.getImgHeight(file);
		System.out.println(i);
	}
	
	 

}